linux-kernel - Re: [PATCH] iio: light: isl29125: fix iio_triggered_buffer

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Date:   Mon, 13 Apr 2020 18:04:39 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>
Subject: Re: [PATCH] iio: light: isl29125: fix
 iio_triggered_buffer_{predisable,postenable} positions

On Wed, 25 Mar 2020 11:42:31 +0000
"Ardelean, Alexandru" <alexandru.Ardelean@...log.com> wrote:

> On Wed, 2020-03-04 at 10:24 +0200, Alexandru Ardelean wrote:
> > The iio_triggered_buffer_{predisable,postenable} functions attach/detach
> > the poll functions.
> > 
> > For the predisable hook, the disable code should occur before detaching
> > the poll func, and for the postenable hook, the poll func should be
> > attached before the enable code.
> > 
> > This change reworks the predisable/postenable hooks so that the pollfunc is
> > attached/detached in the correct position.
> > It also balances the calls a bit, by grouping the preenable and the
> > iio_triggered_buffer_postenable() into a single
> > isl29125_buffer_postenable() function.  
> 
> ping on this patch

Long enough.  Applied to the togreg branch of iio.git and pushed out as testing
for the autobuilders to play with it.

Thanks,

Jonathan

> 
> > 
> > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> > ---
> >  drivers/iio/light/isl29125.c | 28 +++++++++++++++++++---------
> >  1 file changed, 19 insertions(+), 9 deletions(-)
> > 
> > diff --git a/drivers/iio/light/isl29125.c b/drivers/iio/light/isl29125.c
> > index e37894f0ae0b..95611f5eff01 100644
> > --- a/drivers/iio/light/isl29125.c
> > +++ b/drivers/iio/light/isl29125.c
> > @@ -213,13 +213,24 @@ static const struct iio_info isl29125_info = {
> >  	.attrs = &isl29125_attribute_group,
> >  };
> >  
> > -static int isl29125_buffer_preenable(struct iio_dev *indio_dev)
> > +static int isl29125_buffer_postenable(struct iio_dev *indio_dev)
> >  {
> >  	struct isl29125_data *data = iio_priv(indio_dev);
> > +	int err;
> > +
> > +	err = iio_triggered_buffer_postenable(indio_dev);
> > +	if (err)
> > +		return err;
> >  
> >  	data->conf1 |= ISL29125_MODE_RGB;
> > -	return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
> > +	err = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
> >  		data->conf1);
> > +	if (err) {
> > +		iio_triggered_buffer_predisable(indio_dev);
> > +		return err;
> > +	}
> > +
> > +	return 0;
> >  }
> >  
> >  static int isl29125_buffer_predisable(struct iio_dev *indio_dev)
> > @@ -227,19 +238,18 @@ static int isl29125_buffer_predisable(struct iio_dev
> > *indio_dev)
> >  	struct isl29125_data *data = iio_priv(indio_dev);
> >  	int ret;
> >  
> > -	ret = iio_triggered_buffer_predisable(indio_dev);
> > -	if (ret < 0)
> > -		return ret;
> > -
> >  	data->conf1 &= ~ISL29125_MODE_MASK;
> >  	data->conf1 |= ISL29125_MODE_PD;
> > -	return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
> > +	ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
> >  		data->conf1);
> > +
> > +	iio_triggered_buffer_predisable(indio_dev);
> > +
> > +	return ret;
> >  }
> >  
> >  static const struct iio_buffer_setup_ops isl29125_buffer_setup_ops = {
> > -	.preenable = isl29125_buffer_preenable,
> > -	.postenable = &iio_triggered_buffer_postenable,
> > +	.postenable = isl29125_buffer_postenable,
> >  	.predisable = isl29125_buffer_predisable,
> >  };
> >